Researchers at Chalmers Univ. of Technology have discovered that the insulation plastic used in high-voltage cables can withstand a 26% higher voltage if nanometer-sized carbon balls are added. This could result in enormous efficiency gains in the power grids of the future, which are needed to achieve a sustainable energy system.
Graphene has many desirable properties. Magnetism alas is not one of them. Magnetism can be...
A team of chemists at Nagoya Univ. has synthesized novel transition metal-complexed...
Univ. of Wisconsin-Madison materials engineers have made a significant leap toward creating higher-performance electronics with improved battery life and the ability to flex and stretch. The team has reported the highest-performing carbon nanotube transistors ever demonstrated. In addition to paving the way for improved consumer electronics, this technology could also have specific uses in industrial and military applications.
Rice Univ. scientists advanced their recent development of laser-induced graphene by producing and testing stacked, 3-D supercapacitors, energy storage devices that are important for portable, flexible electronics. The Rice laboratory of chemist James Tour discovered last year that firing a laser at an inexpensive polymer burned off other elements and left a film of porous graphene.
Narrow strips of graphene called nanoribbons exhibit extraordinary properties that make them important candidates for future nanoelectronic technologies. A barrier to exploiting them, however, is the difficulty of controlling their shape at the atomic scale, a prerequisite for many possible applications.
An international team of researchers has developed a drug delivery technique that utilizes graphene strips as “flying carpets” to deliver two anticancer drugs sequentially to cancer cells, with each drug targeting the distinct part of the cell where it will be most effective. The technique was found to perform better than either drug in isolation when tested in a mouse model targeting a human lung cancer tumor.
A Northwestern Univ.-led team recently found the answer to a mysterious question that has puzzled the materials science community for years—and it came in the form of some surprisingly basic chemistry. Like many scientists, Jiaxing Huang didn't understand why graphene oxide films were highly stable in water.
New work from Carnegie Institute's Ivan Naumov and Russell Hemley delves into the chemistry underlying some surprising recent observations about hydrogen, and reveals remarkable parallels between hydrogen and graphene under extreme pressures.
New findings could provide a pathway toward a kind of 2-D microchip that would make use of a characteristic of electrons other than their electrical charge, as in conventional electronics. The new approach is dubbed “valleytronics,” because it makes use of properties of an electron that can be depicted as a pair of deep valleys on a graph of their traits.
One major challenge currently facing the graphene industry is difficulty in controlling the quality of graphene sheets when produced over large areas using industrial scale techniques. The key to solving this challenge lies in gaining a thorough understanding of the synthetic methods used to fabricate macro-sized single-layer graphene films.
For decades, the mantra of electronics has been smaller, faster, cheaper. Today, Stanford Univ. engineers add a fourth word: taller. A Stanford team revealed how to build high-rise chips that could leapfrog the performance of the single-story logic and memory chips on today's circuit cards.
Single-walled carbon nanotubes are loaded with desirable properties. In particular, the ability to conduct electricity at high rates of speed makes them attractive for use as nanoscale transistors. But this and other properties are largely dependent on their structure, and their structure is determined when the nanotube is just beginning to form.
Graphene’s great strength appears to be determined by how well it stretches before it breaks, according to Rice Univ. scientists who tested the material’s properties by peppering it with microbullets. The 2-D carbon honeycomb discovered a decade ago is thought to be much stronger than steel. But the scientists didn’t need even a pound of graphene to prove the material is on average 10 times better than steel at dissipating kinetic energy.
Graphene, impermeable to all gases and liquids, can easily allow protons to pass through it, Univ. of Manchester researchers have found. Published in Nature, the discovery could revolutionize fuel cells and other hydrogen-based technologies as they require a barrier that only allow protons to pass through.
Physicists at the Univ. of Kansas have fabricated an innovative substance from two different atomic sheets that interlock much like Lego toy bricks. The researchers said the new material, made of a layer of graphene and a layer of tungsten disulfide, could be used in solar cells and flexible electronics.
The improvements in random access memory (RAM) that have driven many advances of the digital age owe much to the innovative application of physics and chemistry at the atomic scale. Accordingly, a team led by Univ. of Nebraska-Lincoln researchers has employed a Nobel Prize-winning material and common household chemical to enhance the properties of a component primed for the next generation of high-speed, high-capacity RAM.
Researchers at Massachusetts Institute of Technology say they have carried out a theoretical analysis showing that a family of 2-D materials exhibits exotic quantum properties that may enable a new type of nanoscale electronics. These materials are predicted to show a phenomenon called the quantum spin Hall (QSH) effect, and belong to a class of materials known as transition metal dichalcogenides, with layers a few atoms thick.
Rice Univ. scientists have invented a novel cathode that may make cheap, flexible dye-sensitized solar cells practical. The Rice laboratory of materials scientist Jun Lou created the new cathode, one of the two electrodes in batteries, from nanotubes that are seamlessly bonded to graphene and replaces the expensive and brittle platinum-based materials often used in earlier versions.
After graphene was first produced in the laboratory in 2004, thousands of laboratories began developing graphene products worldwide. Researchers were amazed by its lightweight and ultra-strong properties. Ten years later, scientists now search for other materials that have the same level of potential.
Univ. of Utah engineers have developed a new type of carbon nanotube material for handheld sensors that will be quicker and better at sniffing out explosives, deadly gases and illegal drugs. Carbon nanotubes are known for their strength and high electrical conductivity and are used in products from baseball bats and other sports equipment to lithium-ion batteries and touchscreen computer displays.
A team led by the Lawrence Livermore National Laboratory scientists has created a new kind of ion channel consisting of short carbon nanotubes, which can be inserted into synthetic bilayers and live cell membranes to form tiny pores that transport water, protons, small ions and DNA. These carbon nanotube “porins” have significant implications for future health care and bioengineering applications.
Researchers in the U.K. have found a new way to make nanostructured carbon using the waste product sawdust. By cooking sawdust with a thin coating of iron at 700 C, they have discovered that they can create carbon with a structure made up of many tiny tubes. These tubes are one thousand times smaller than an average human hair.
Univ. of Oregon chemists have devised a way to see the internal structures of electronic waves trapped in carbon nanotubes by external electrostatic charges. Their atomic scale observations provide a detailed view of traps that disrupt energy flow, possibly pointing toward improved charge-carrying devices.
Researchers in Australia have discovered that nano-sized fragments of graphene have the ability to speed up the rate of chemical reactions. The finding is significant, say researchers, because it suggested that graphene might have potential applications in catalyzing chemical reactions of industrial importance.
Researchers at the Univ. of Pennsylvania and The Children's Hospital of Philadelphia have used graphene to fabricate a new type of microelectrode that solves a major problem for investigators looking to understand the intricate circuitry of the brain. The see-through, one-atom-thick electrodes can obtain both high-resolution optical images and electrophysiological data for the first time.
Personal electronics such as cell phones and laptops could get a boost from some of the lightest materials in the world. Lawrence Livermore National Laboratory researchers have turned to graphene aerogel for enhanced electrical energy storage that eventually could be used to smooth out power fluctuations in the energy grid.
Graphene’s exotic properties can be tailored by cutting large sheets down to ribbons of specific lengths and edge configurations. But this “top-down” fabrication approach is not yet practical, because current lithographic techniques always produce defects. Now, scientists from the U.S. and Japan have discovered a new “bottom-up” self-assembly method for producing defect-free graphene nanoribbons with periodic zigzag-edge regions.
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